Tractor



FIG. 1 is a front view of the tractor;

FIG. 2 is a back view of the tractor;

FIG. 3 is a left side view of the tractor;

FIG. 4 is a right side view of the tractor;

FIG. 5 is a plan view of the tractor;

FIG. 6 is a bottom view of the tractor; and,

FIG. 7 is a perspective view of the tractor. 

The ornamental design for a tractor, as shown. 